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Evidence weed killers improve food nutrition


July 10, 2009
By Marg Land


Topics

sweetcorn03July 10, 2009 — Scientists are reporting for the first time that the
use of weed killers in farmers’ fields boosts the nutritional value of
an important food a crop.

July 10, 2009 — Scientists are reporting for the first time that the use of weed killers in farmers’ fields boosts the nutritional value of an important food a crop.

sweetcorn03 
  

Application of two common herbicides to several varieties of sweet corn significantly increased the amount of key nutrients – termed carotenoids – in the corn kernels, according to a new study.

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In the new study, Dean Kopsell and colleagues note that farmers grow about 240,000 acres of sweet corn in the U.S. each year, making it an important food crop. Corn is among only a few vegetable crops that are good sources of zeaxanthin carotenoids. Consuming carotenoid-rich vegetables may reduce the risk of age-related macular degeneration (a leading cause of vision loss among older people), heart disease, and cancer, the study notes.

The scientists exposed several varieties of sweet corn plants to the herbicide mesotrione or a combination of mesotrione and atrazine, another commonly used weed killer, and harvested mature corn 45 days later. Herbicide applications made the corn an even-better source of carotenoids, boosting levels in the mature kernels of some varieties by up to 15 percent. It specifically increased levels of lutein and zeaxanthin, the major carotenoids in sweet corn kernels, which studies have linked to a reduced risk of age-related macular degeneration.